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A convenient way to add bookmarks.
Preview the Google ads that may show on any web page.
Quickly switch between sidebars, view dialog windows such as downloads, extensions, and more in the sidebar, or view source or websites in the sidebar. It includes a slide-out button and a toolbar, all of which can be extensively customized.
dumps ALL cookies to cookies.txt file
Open in new tabs when you click on bookmark, history, cached closed tab items.
Save frequently-entered text for pasting later.
Examines the colour contrast of elements in the DOM.
Copies to clipboard the document's URL along with the title or the selected text.
Gives a possibility to create custom toolbarbuttons.
Keep, share and discover all your favorite things.
Adds a sidebar with web-development references.
Adds PHP reference to DevBoi
Adds Ruby and Rails references to DevBoi
Adds XUL reference to DevBoi
Prevents download links opening a blank window.
Inspect the DOM of HTML, XUL, and XML pages, including the browser chrome.
Automatically save downloads to different directories.
View and manage downloads from a tidy statusbar
The mass downloader for Firefox.
Allows you to duplicate a tab, or to merge the windows.
Renders a text version of a web page similar to screen reader output.
This extension adds UI for replacing bookmark icons.
Web Debugging Evolved
Easily locate any browser you've opened in Firefox
Focus Last Selected Tab
A User Script Manager for Firefox
Translates the selected text via Google Translate.
Adds HTML validation to the View Page Source of the browser. The validation is done by Tidy from W3c.
Lists installed extensions and themes
Inspect the current element with the DOM Inspector.
Rebind your keys.
This extension pops up an alert dialog to warn chrome and extension developers about one particular type of leak. It warns when windows close but leave other code pointing at their JavaScript objects.
Open/download/validate links and pictures in tabs or windows
View HTTP headers of a page and while browsing.
Draw out a ruler to get the pixel width and height of any elements on a webpage.
Adds about: options to Help Menu and Toolbar buttons.
A full featured blog editor that sits right in your Firefox browse and lets you post to your blog easily.
Reloads webpages every so many seconds or minutes
A lightweight RSS and Atom feed aggregator.
Helps you to save Web pages and organize the collection.
Display the Google PageRank and Alexa ranking with search-related tools.
Middle click for javascript links.
Turns the stop and reload buttons into a single one. When you can stop, you have a Stop button, otherwise you have a Reload button. (Like in Safari)
Customize the look of websites and of the user interface.
Adds context menu trees, that let you search selected terms using the selected search engine. Ships with three service lists, but you can load termBlaster files for different search engines.
Treats selected plain text urls, and email addresses as links and adds options to the context menu on how to use these.
Adds a menu and a toolbar with various web developer tools.
See the tags on a page without viewing the sourcecode.